It's not even October yet - October being, of course, the (unofficial) Month of the Prankster - but we already have a candidate for the most terrifying prank of the year. It's also one of the funniest.

Now, you might feel awful for laughing, given you would pretty much definitely scream loudly and run very fast indeed if you encountered this 'mutant giant spider dog' while out for an evening walk.

From the safety of your computer monitor, though, these poor victims' reactions are priceless, even though it is very unlikely any of us would respond any more reasonably when confronted by this sort of situation.

Anyway, check out the prank below. If you have arachnophobia and/or cynophobia, be warned you're probably not going to enjoy this one: